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Project Description
This project provides a for .NET development convenient implementation of the GRC Perfect Paper Passwords system in a C# Class Library.

The class library uses an included Interop wrapper for the ppp.dll library as provided by GRC (see: and which can be used freely.

As quoted from the GRC PPP Design & Operation page (see: 'GRC's "Perfect Paper Passwords" (PPP) system is a straightforward, simple and secure implementation of a paper-based One Time Password (OTP) system. When used in conjunction with an account name & password, the individual "passcodes" contained on PPP's "passcards" serve as the second factor ("something you have") of a secure multi-factor authentication system.'

Last edited Nov 11, 2007 at 8:33 PM by DenEijk, version 5